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常规控制图主要有计量控制图和计数控制图两种类型。计量控制图包括均值—极差控制图、均值—标准差控制图、单值—移动极差控制图和中位数—极差控制图;计数控制图包括不合格品率控制图、不合格品数控制图、单位不合格数控制图和不合格数控制图。应用常规控制图的实践中通常要经过建立和使用控制图两个阶段,即分析用控制图阶段和控制用控制图阶
Conventional control charts are mainly two kinds of measurement control charts and count control charts. Metering control charts include mean-range control chart, mean-standard deviation control chart, single-value range control chart and median-range control chart; count control chart includes reject rate control chart, Control chart, the unit number of unqualified control chart and the number of unqualified control chart. The application of conventional control charts usually go through the establishment and use of control charts in two phases, namely, the control chart phase and the control chart